Firebase Detecting if user exists

Question

How Can I Check user exists in Firebase auth in Signup Button via react native?

This is my Login Page Code:

export de         


        

Answer 1

It is very simple. Add a then() and catch() to your firebase method in signUp function.

firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
.then(()=>{
    console.log('Signup successful.');
    this.setState({
            response: 'Account Created!'
        })
   })
.catch((error)=> {
    console.log(error.code);
    console.log(error.message);
  });

Information on different Error Codes:

• auth/email-already-in-use

  Thrown if there already exists an account with the given email address.

• auth/invalid-email

  Thrown if the email address is not valid.

• auth/operation-not-allowed

  Thrown if email/password accounts are not enabled. Enable email/password accounts in the Firebase Console, under the Auth tab.

• auth/weak-password

  Thrown if the password is not strong enough.